MHT CET 2024 Physics question

For a light ray to undergo total internal reflection (i = angle of incidence, = critical angle)

(A)light travels from denser to rarer medium and
(B)light travels from rarer to denser medium and
(C)light travels from denser to rarer medium and Correct
(D)light travels from rarer to denser medium and

Answer: (C)

Solution

Total internal reflection needs two conditions. (1) The ray must travel from a denser (higher refractive index) medium to a rarer one, because only then does the refracted ray bend away from the normal, so that the angle of refraction can reach at a finite angle of incidence, the critical angle given by

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Question ID VK-096787